| trying(adjective, hard, difficult, complex) |
| unbearable(adjective, hard, difficult, complex) |
| substantial(adjective, importance, big, heavy, important) |
| pressing(adjective, hard, tough, difficult, big) |
| dangerous(adjective, help, bad, great, severe) |
| crucial(adjective, great, severe, extraordinary, big) |
| grand(adjective, importance, valuable, main, greatness) |
| great(adjective, importance, valuable, main, notable) |
| meaningful(adjective, good, great, severe, extraordinary) |
| sincere(noun, adjective, open, keen, warm) |
| acute(adjective, severe, harsh, heavy, important) |
| big(adjective, good, importance, heavy, important) |
| urgent(adjective, hard, tough, severe, difficult) |
| material(adjective, good, importance, big, heavy) |
| portentous(adjective, importance, valuable, main, notable) |
| considerable(adjective, importance, big, heavy, important) |
| key(adjective, importance, important, valuable, main) |
| sombre(adjective, solemn) |
| deep(adjective, keen, important, significant, thoughtful) |
| essential(adjective, severe, importance, big, important) |